The reason for not getting pregnant during ovulation is because ovulation is early. This is why in clinical practice, many people still get pregnant even though they obviously have intercourse during the safe period. In fact, the menstrual cycle of every woman is not always very accurate. Some people have periods once every twenty-eight days, some thirty days, and some forty days. Even for those who get their period once every twenty-eight days, ovulation is not always on the fourteenth day, so some people ovulate earlier. When ovulation is early, if you have intercourse on that day, you will get pregnant. So the choice of contraceptive measures, it is recommended to choose the tool contraception, that is, condoms, will be safer. Because some people need to take the pill through the metabolism of liver and kidney function, it is not good for liver and kidney function, and some people are not comfortable with the ring, will be back pain, also not good. So the choice of contraceptive methods, it is recommended that the tool contraception.